SqlServer数据类型、C#SqlDbType对应关系及转换

// sqlDbType转换为C#数据类型
 2 public static Type sqlType2CsharpType(sqlDbType sqlType)
 3 {
 4 switch (sqlType)
 5 {
 6        case sqlDbType.BigInt:
 7          return typeof(Int64);
 8        case sqlDbType.Binary:
 9          typeof(Object);
10        case sqlDbType.Bit:
11          typeof(Boolean);
12        case sqlDbType.Char:
13          typeof(String);
14        case sqlDbType.DateTime:
15          typeof(DateTime);
16        case sqlDbType.Decimal:
17          typeof(Decimal);
18        case sqlDbType.Float:
19          typeof(Double);
20        case sqlDbType.Image:
21          22        case sqlDbType.Int:
23          typeof(Int32);
24        case sqlDbType.Money:
25          26        case sqlDbType.NChar:
27          28        case sqlDbType.NText:
29          30        case sqlDbType.NVarChar:
31          32        case sqlDbType.Real:
33          typeof(Single);
34        case sqlDbType.SmallDateTime:
35          36        case sqlDbType.SmallInt:
37          typeof(Int16);
38        case sqlDbType.SmallMoney:
39          40        case sqlDbType.Text:
41          42        case sqlDbType.Timestamp:
43          44        case sqlDbType.tinyint:
45          typeof(Byte);
46        case sqlDbType.Udt:自定义的数据类型47          48        case sqlDbType.UniqueIdentifier:
49          50        case sqlDbType.VarBinary:
51          52        case sqlDbType.VarChar:
53          54        case sqlDbType.Variant:
55          56        case sqlDbType.Xml:
57          58        default:
59          null;
60 }
61 }

 sql server数据类型（如：varchar）
 转换为sqlDbType类型 3 static sqlDbType sqlTypestring2sqlType(string sqlTypestring)
 4 {
 5 sqlDbType dbType = sqlDbType.Variant;默认为Object 6 
 7 switch (sqlTypestring)
 8 {
 9        case "int":
10          dbType = sqlDbType.Int;
break;
varchar13          dbType = sqlDbType.VarChar;
14          15        bit16          dbType = sqlDbType.Bit;
datetime19          dbType = sqlDbType.DateTime;
20          21        decimal22          dbType = sqlDbType.Decimal;
float25          dbType = sqlDbType.Float;
26          27        image28          dbType = sqlDbType.Image;
money31          dbType = sqlDbType.Money;
32          33        ntext34          dbType = sqlDbType.NText;
nvarchar37          dbType = sqlDbType.NVarChar;
38          39        smalldatetime40          dbType = sqlDbType.SmallDateTime;
smallint43          dbType = sqlDbType.SmallInt;
44          45        text46          dbType = sqlDbType.Text;
bigint49          dbType = sqlDbType.BigInt;
50          51        binary52          dbType = sqlDbType.Binary;
char55          dbType = sqlDbType.Char;
56          57        nchar58          dbType = sqlDbType.NChar;
60        numeric61          dbType = sqlDbType.Decimal;
62          63        real64          dbType = sqlDbType.Real;
65          66        smallmoney67          dbType = sqlDbType.SmallMoney;
68          69        sql_variant70          dbType = sqlDbType.Variant;
71          72        timestamp73          dbType = sqlDbType.Timestamp;
74          75        tinyint76          dbType = sqlDbType.tinyint;
77          78        uniqueidentifier79          dbType = sqlDbType.UniqueIdentifier;
80          81        varbinary82          dbType = sqlDbType.VarBinary;
83          84        xml85          dbType = sqlDbType.Xml;
86          87 }
88 return dbType;
89 }

sql server中的数据类型，转换为C#中的类型类型static Type sqlTypestring2CsharpType( 4 sqlDbType dbTpe = sqlTypestring2sqlType(sqlTypestring);
5
6 return sqlType2CsharpType(dbTpe);
7 }
8
9 将sql server中的数据类型，转化为C#中的类型的字符串10 static string sqlTypestring2CsharpTypestring(11 {
12 Type type = sqlTypestring2CsharpType(sqlTypestring);
13
14 return type.Name;
15 }